“Senator Frum’s primary residence is in Toronto, Ontario,” the report reads. “She rents an apartment in the (National Capital Region) for $2,500 per month and receives $22,000 per annum as a housing allowance.”

(Based on that math, the housing allowance doesn’t cover a full year’s worth of rent, which would be $30,000, leaving Frum to pick up the remaining $8,000 out of pocket.)

The Senate’s housing allowance policy that allows senators whose primary residence is more than 100 kilometres from Parliament Hill to claim up to $22,000 a year for a secondary home in Ottawa.

For senators Patrick Brazeau and Mike Duffy and former senator Mac Harb, the Senate determined the location of their primary residences was within the 100-kilometre limit. The Senate deemed the expenses ineligible, even though auditors found the rules unclear.

Sen. Doug Black — the first senator to post detailed expense reports — reveals how much he pays in rent each month.

Liberals in the Senate have also started posting their expense claims on the party’s website, although those are modeled on ministerial expense disclosures that only outline travel and hospitality expenses.

The slowly growing number of senators posting their expenses online is likely to increase pressure on the rest of the chamber to come up with a disclosure template for other senators to use. The Senate’s internal economy committee was expected to look at the issue this fall.